Defensewall/Sandboxie/PDFViewer

I have been running Defensewall and Sandboxie together for some time now for day to day browsing.
Both seem to run very well together the only problem i have come across is when i try and open a PDF file in the browser (Firefox) i always get Sandboxie errors "SBIE2399 service RPCSS fails with error 1066. Last checkpoint was 1". and SBIE2399 service RpcEptMapper fails with error 1066. Last checkpoint was 1"

Now i think this is to do with Defensewalls resource protection preventing the pdf from loading.
It works fine when using DW or SB on there own.

I have just tried this Ilya, i had two pop ups with PDF viewer and sandboxie rpcss.exe wanting access to prtected file firefox clicked allow this event next time, but i am still getting the same errors.
Attatched the latest log for the event after closing firefox and restarting and then trying to open pdf in firefox.